JPS644903A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS644903A
JPS644903A JP16001987A JP16001987A JPS644903A JP S644903 A JPS644903 A JP S644903A JP 16001987 A JP16001987 A JP 16001987A JP 16001987 A JP16001987 A JP 16001987A JP S644903 A JPS644903 A JP S644903A
Authority
JP
Japan
Prior art keywords
head
erasing head
medium
erasing
maximum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16001987A
Other languages
Japanese (ja)
Inventor
Hiroaki Muraoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP16001987A priority Critical patent/JPS644903A/en
Publication of JPS644903A publication Critical patent/JPS644903A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Landscapes

  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To prevent a leakage flux from being generated from an erasing head at the time of recording, by setting the cavity length of the erasing head larger than length equivalent to the product of the maximum stoppage time of a current being impressed on the erasing head and the maximum relative velocity between a magnetic head and a magnetic recording medium. CONSTITUTION:The operating time TE of a monostable multivibrator 22 is set smaller than the minimum pulse interval T of a write data signal 21. A period tS when an erasing current stops is set as tS<2T-tE against the pulse interval 2XT of the maximum write data. Therefore, by selecting the cavity length GE of the erasing head so as to be GE>tSXVmax against the maximum relative velocity between the head and the medium, it is possible to set all of the areas so that the magnetic field of the erasing head can be impressed on them on the medium. In such a way, it is possible to stop a harmful leakage flux from the erasing head at a moment to write magnetization inversion on the medium.
JP16001987A 1987-06-26 1987-06-26 Magnetic disk device Pending JPS644903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16001987A JPS644903A (en) 1987-06-26 1987-06-26 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16001987A JPS644903A (en) 1987-06-26 1987-06-26 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS644903A true JPS644903A (en) 1989-01-10

Family

ID=15706219

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16001987A Pending JPS644903A (en) 1987-06-26 1987-06-26 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS644903A (en)

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